Why is the vertical cross-section along a tectonically active region of the coast so steep? a) the subduction if one plate under another plate along the trench b) the active margin is starved of sediment from land that prevents the margin from developing c) the active margin experiences numerous earthquakes that forces sediment farther into the ocean where it accumulates along the abyssal plain

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

Answermongolia;